text: /* This file is part of libmspack.
   * (C) 2003-2004 Stuart Caie.
   *
   * libmspack is free software; you can redistribute it and/or modify it under
   * the terms of the GNU Lesser General Public License (LGPL) version 2.1
   *
   * For further details, see the file COPYING.LIB distributed with libmspack
   */
  
  #ifndef MSPACK_CAB_H
  #define MSPACK_CAB_H 1
  
  #include "mszip.h"
  #include "qtm.h"
  #include "lzx.h"
  #include "mspack.h"
  /* generic CAB definitions */
  
  /* structure offsets */
  #define cfhead_Signature         (0x00)
  #define cfhead_CabinetSize       (0x08)
  #define cfhead_FileOffset        (0x10)
  #define cfhead_MinorVersion      (0x18)
  #define cfhead_MajorVersion      (0x19)
  #define cfhead_NumFolders        (0x1A)
  #define cfhead_NumFiles          (0x1C)
  #define cfhead_Flags             (0x1E)
  #define cfhead_SetID             (0x20)
  #define cfhead_CabinetIndex      (0x22)
  #define cfhead_SIZEOF            (0x24)
  #define cfheadext_HeaderReserved (0x00)
  #define cfheadext_FolderReserved (0x02)
  #define cfheadext_DataReserved   (0x03)
  #define cfheadext_SIZEOF         (0x04)
  #define cffold_DataOffset        (0x00)
  #define cffold_NumBlocks         (0x04)
  #define cffold_CompType          (0x06)
  #define cffold_SIZEOF            (0x08)
  #define cffile_UncompressedSize  (0x00)
  #define cffile_FolderOffset      (0x04)
  #define cffile_FolderIndex       (0x08)
  #define cffile_Date              (0x0A)
  #define cffile_Time              (0x0C)
  #define cffile_Attribs           (0x0E)
  #define cffile_SIZEOF            (0x10)
  #define cfdata_CheckSum          (0x00)
  #define cfdata_CompressedSize    (0x04)
  #define cfdata_UncompressedSize  (0x06)
  #define cfdata_SIZEOF            (0x08)
  
  /* flags */
  #define cffoldCOMPTYPE_MASK            (0x000f)
  #define cffoldCOMPTYPE_NONE            (0x0000)
  #define cffoldCOMPTYPE_MSZIP           (0x0001)
  #define cffoldCOMPTYPE_QUANTUM         (0x0002)
  #define cffoldCOMPTYPE_LZX             (0x0003)
  #define cfheadPREV_CABINET             (0x0001)
  #define cfheadNEXT_CABINET             (0x0002)
  #define cfheadRESERVE_PRESENT          (0x0004)
  #define cffileCONTINUED_FROM_PREV      (0xFFFD)
  #define cffileCONTINUED_TO_NEXT        (0xFFFE)
  #define cffileCONTINUED_PREV_AND_NEXT  (0xFFFF)
  
  /* CAB data blocks are <= 32768 bytes in uncompressed form. Uncompressed
   * blocks have zero growth. MSZIP guarantees that it won't grow above
   * uncompressed size by more than 12 bytes. LZX guarantees it won't grow
   * more than 6144 bytes. Quantum has no documentation, but the largest
   * block seen in the wild is 337 bytes above uncompressed size.
   */
  #define CAB_BLOCKMAX (32768)
  #define CAB_INPUTMAX (CAB_BLOCKMAX+6144)
  
  /* There are no more than 65535 data blocks per folder, so a folder cannot
   * be more than 32768*65535 bytes in length. As files cannot span more than
   * one folder, this is also their max offset, length and offset+length limit.
   */
  #define CAB_FOLDERMAX (65535)
  #define CAB_LENGTHMAX (CAB_BLOCKMAX * CAB_FOLDERMAX)
  
  /* CAB compression definitions */
  
  struct mscab_compressor_p {
    struct mscab_compressor base;
    struct mspack_system *system;
    /* todo */
  };
  
  /* CAB decompression definitions */
  
  struct mscabd_decompress_state {
    struct mscabd_folder_p *folder;    /* current folder we're extracting from */
    struct mscabd_folder_data *data;   /* current folder split we're in        */
    unsigned int offset;               /* uncompressed offset within folder    */
    unsigned int block;                /* which block are we decompressing?    */
    struct mspack_system sys;          /* special I/O code for decompressor    */
    int comp_type;                     /* type of compression used by folder   */
    int (*decompress)(void *, off_t);  /* decompressor code                    */
    void *state;                       /* decompressor state                   */
    struct mscabd_cabinet_p *incab;    /* cabinet where input data comes from  */
    struct mspack_file *infh;          /* input file handle                    */
    struct mspack_file *outfh;         /* output file handle                   */
    unsigned char *i_ptr, *i_end;      /* input data consumed, end             */
    unsigned char input[CAB_INPUTMAX]; /* one input block of data              */
  };
  
  struct mscab_decompressor_p {
    struct mscab_decompressor base;
    struct mscabd_decompress_state *d;
    struct mspack_system *system;
    int param[3]; /* !!! MATCH THIS TO NUM OF PARAMS IN MSPACK.H !!! */
    int error, read_error;
  };
  
  struct mscabd_cabinet_p {
    struct mscabd_cabinet base;
    off_t blocks_off;                  /* offset to data blocks                */
    int block_resv;                    /* reserved space in data blocks        */
  };
  
  /* there is one of these for every cabinet a folder spans */
  struct mscabd_folder_data {
    struct mscabd_folder_data *next;
    struct mscabd_cabinet_p *cab;      /* cabinet file of this folder span     */
    off_t offset;                      /* cabinet offset of first datablock    */
  };
  
  struct mscabd_folder_p {
    struct mscabd_folder base;
    struct mscabd_folder_data data;    /* where are the data blocks?           */
    struct mscabd_file *merge_prev;    /* first file needing backwards merge   */
    struct mscabd_file *merge_next;    /* first file needing forwards merge    */
  };
  
  #endif
  